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NO. 3 OSBURN : EASTERN PACIFIC BRYOZOA CYCLOSTOMATA 623
Proboscina incrassata (Smitt), 1866
Plate 66, figs. 1 and 2
Proboscina incrassata Smitt, 1866:402 and 458.
Tubulipora (Proboscina) incrassata Smitt, 1871:1119.
Alecto retiformis Hincks, 1871:81.
Stomatopora incrassata, Hincks, 1880:436.
Stomatopora incrassata, O'Donoghue, 1923:11.
Proboscina incrassata, O'Donoghue, 1926:17.
The zoarium is white, adnate, much branched, the branches short,
anastomosing to form often a fairly close network; on the basal part the
branches are usually two tubules in width, but at the distal ends they
may be 4 to 6 tubules wide. The peristomes are very irregular in arrangement, single or 2 or 3 in a transverse line; sometimes a few are
clustered but they are never connate except occasionally at the base;
sometimes also these clusters are elevated into short fascicles, especially
at the ends of branches. The peristomes are usually quite erect, 0.50 to
1.0 mm in height, 0.26 mm in diameter, and aperture about 0.20 mm.
The ovicells, which seem not to have been noticed previously, are
simple ventricose expansions near the ends of branches and surrounded
by a row of tubules on each side (occasionally a peristome may be enclosed in the expansion) ; the ooeciostome is a small erect tube much
shorter than the peristomes, terminal or nearly so, usually connate with
a peristome at its base but the tip always free, the aperture round and
about 0.13 mm in diameter.
Described from Spitsbergen and recorded from Norway, Nova Zem-
bla, Kara Sea, and the British Islands from Cornwall to Scotland and
the Shetland Islands. On the Pacific coast O'Donoghue listed it for
several localities in British Columbia. Point Barrow, Alaska, Arctic
Research Laboratory, 328 feet, a common species, especially on stones,
G. E. MacGinitie, collector.
Proboscina lamellifera Canu and Bassler, 1930
Plate 66, fig. 3
Proboscina lamellifera Canu and Bassler, 1930:46.
"The zoarium incrusts shells and is formed of sinuous branches joined
together by a smooth calcareous lamella. The tubes are indistinct, short,
seriated and terminated by a long peristome perpendicular to the zoarial
plane. Measurements, — diameter of orifice, 0.12 mm; diameter of
peristome, 0.16 mm; internal separation of tubes, 0.20 - 0.30 mm; width
of branches 1.5 mm." (Canu and Bassler, 1930:46).

NO. 3 OSBURN : EASTERN PACIFIC BRYOZOA CYCLOSTOMATA 623
Proboscina incrassata (Smitt), 1866
Plate 66, figs. 1 and 2
Proboscina incrassata Smitt, 1866:402 and 458.
Tubulipora (Proboscina) incrassata Smitt, 1871:1119.
Alecto retiformis Hincks, 1871:81.
Stomatopora incrassata, Hincks, 1880:436.
Stomatopora incrassata, O'Donoghue, 1923:11.
Proboscina incrassata, O'Donoghue, 1926:17.
The zoarium is white, adnate, much branched, the branches short,
anastomosing to form often a fairly close network; on the basal part the
branches are usually two tubules in width, but at the distal ends they
may be 4 to 6 tubules wide. The peristomes are very irregular in arrangement, single or 2 or 3 in a transverse line; sometimes a few are
clustered but they are never connate except occasionally at the base;
sometimes also these clusters are elevated into short fascicles, especially
at the ends of branches. The peristomes are usually quite erect, 0.50 to
1.0 mm in height, 0.26 mm in diameter, and aperture about 0.20 mm.
The ovicells, which seem not to have been noticed previously, are
simple ventricose expansions near the ends of branches and surrounded
by a row of tubules on each side (occasionally a peristome may be enclosed in the expansion) ; the ooeciostome is a small erect tube much
shorter than the peristomes, terminal or nearly so, usually connate with
a peristome at its base but the tip always free, the aperture round and
about 0.13 mm in diameter.
Described from Spitsbergen and recorded from Norway, Nova Zem-
bla, Kara Sea, and the British Islands from Cornwall to Scotland and
the Shetland Islands. On the Pacific coast O'Donoghue listed it for
several localities in British Columbia. Point Barrow, Alaska, Arctic
Research Laboratory, 328 feet, a common species, especially on stones,
G. E. MacGinitie, collector.
Proboscina lamellifera Canu and Bassler, 1930
Plate 66, fig. 3
Proboscina lamellifera Canu and Bassler, 1930:46.
"The zoarium incrusts shells and is formed of sinuous branches joined
together by a smooth calcareous lamella. The tubes are indistinct, short,
seriated and terminated by a long peristome perpendicular to the zoarial
plane. Measurements, — diameter of orifice, 0.12 mm; diameter of
peristome, 0.16 mm; internal separation of tubes, 0.20 - 0.30 mm; width
of branches 1.5 mm." (Canu and Bassler, 1930:46).